SystemTrayMenu/NativeDllImport/BringWindowToTop.cs

// <copyright file="BringWindowToTop.cs" company="PlaceholderCompany">
// Copyright (c) PlaceholderCompany. All rights reserved.
// </copyright>

namespace SystemTrayMenu.DllImports
{
    using System;
    using System.Runtime.InteropServices;

    /// <summary>
    /// wraps the methodcalls to native windows dll's.
    /// </summary>
    public static partial class NativeMethods
    {
        private const int SwRestore = 9;

        public static void ForceForegroundWindow(IntPtr hWnd)
        {
            uint foreThread = GetWindowThreadProcessId(GetForegroundWindow(), IntPtr.Zero);
            uint appThread = GetCurrentThreadId();
            const int SW_SHOW = 5;

            int cmdShow = SW_SHOW;

            if (IsIconic(hWnd))
            {
                cmdShow = SwRestore;
            }

            if (foreThread != appThread)
            {
                AttachThreadInput(foreThread, appThread, true);
                BringWindowToTop(hWnd);
                ShowWindow(hWnd, cmdShow);
                AttachThreadInput(foreThread, appThread, false);
            }
            else
            {
                BringWindowToTop(hWnd);
                ShowWindow(hWnd, cmdShow);
            }
        }

        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
        [DefaultDllImportSearchPaths(DllImportSearchPath.UserDirectories)]
        private static extern bool IsIconic(IntPtr hWnd);

        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
        [DefaultDllImportSearchPaths(DllImportSearchPath.UserDirectories)]
        private static extern IntPtr GetForegroundWindow();

        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
        [DefaultDllImportSearchPaths(DllImportSearchPath.UserDirectories)]
        private static extern uint GetWindowThreadProcessId(IntPtr hWnd, IntPtr processId);

        [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
        [DefaultDllImportSearchPaths(DllImportSearchPath.UserDirectories)]
        private static extern uint GetCurrentThreadId();

        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
        [DefaultDllImportSearchPaths(DllImportSearchPath.UserDirectories)]
        private static extern bool AttachThreadInput(uint idAttach, uint idAttachTo, bool fAttach);

        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
        [DefaultDllImportSearchPaths(DllImportSearchPath.UserDirectories)]
        private static extern bool BringWindowToTop(IntPtr hWnd);
    }
}